Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Security
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transferred of assets in or out of level 3	$ 0
Transferred of liabilities in or out of level 3	0
Security transfer from Level 3 to Level 2 | Security		1
Collateral dependent loans categorized as Level 3		$ 8,857
Specific allocation for collateral dependent impaired loans		1,996
Impairment	7
Collateral Dependent [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Specific allocation for collateral dependent impaired loans	386	2,000
Level 3 [Member] | Collateral Dependent [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Collateral dependent loans categorized as Level 3	22,700	2,700
1-4 Family Real Estate Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment	2
Agricultural Real Estate Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Collateral dependent loans categorized as Level 3		$ 2,280
Impairment	$ 5